Build SpinS from the generated parser sources committed in its repository.
The vendored JavaCC jar is removed by the ebuild.  Target Java 8 explicitly
while allowing Gentoo to use a current build JDK.

--- a/spins/src/build.xml
+++ b/spins/src/build.xml
@@ -28 +28 @@
-	<target name="build" depends="javacc">
+	<target name="build" depends="prepare">
@@ -64,2 +64,2 @@
-			   includeantruntime="yes">
-			  <compilerarg line="-Xprefer:newer -XDignore.symbol.file" />
+			   release="8"
+			   includeantruntime="false">